Apparatus for recording plural holographic images into a hologra

Details Apparatus for recording plural holographic images into a hologra Apparatus for recording plural holographic images into a hologra

1990-06-29

1992-03-24

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Using modulated or plural reference beams

359 22, 359 24, G03H 112

Patent

active

050981765

ABSTRACT:
A control arrangement for a galvanometer driven mirror whereby the angle of incidence of a beam on a holographic recording material is controlled includes a laser source and associated detector. The detector responds to a reflected position sensing beam incident thereon to generate electric currents. A ratio network forms the ratio of the sum and difference of the currents to generate an actual mirror position signal that is independent of the power output of the source of the sensing beam. An integrator is responsive to the error between the signal representative of the actual mirror position and a reference signal representative of a predetermined position of the mirror for forming a galvanometer position signal.

REFERENCES:
patent: 3492652 (1970-01-01), Van Heerden
patent: 3572882 (1971-03-01), Neumann
patent: 3657473 (1972-04-01), Corcoran

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